In a tweet to customers today the bank stated: "Apologies to our customers who can't access internet Banking & the Mobile App at the moment - we're working to fix this ASAP. You can still access ATMs, EFTPOS facilities and branch services as usual."

The outage was felt across Australia as a map revealed hotspots in most states where custoemrs were experiencing issues with their banking.

A NAB outage map. Picture: Downdetector.com.au

WHile the NAB has been quick to respond to custoemrs, it hasn't stopped NAB customers from venting on social media.